title: The effect of bleaching agent on composite/enamel bonding.
abstract: This in vitro study evaluates the effect of an in-office light-activated hydrogen peroxide bleaching agent on the shear bond strength of composite resin to etched enamel. Specimens were divided into 4 groups. Group 1 specimens were not bleached and served as the control; Group 2 consisted of specimens bonded immediately after bleaching; Groups 3 and 4 of specimens bonded 1 and 2 weeks respectively after bleaching. The mean shear bond strengths (MPa) of Groups 2 (14.2 +/- 4.9), 3(19.2 +/- 3.2) and 4 (23.1 +/- 3.7) were lower than the value obtained in Group 1 (25.1 +/- 3.7). Groups 2 and 3 had significantly lower shear bond strengths than the unbleached Group 1 (25.1 +/- 3.7). It is suggested that bonding procedures be postponed for two weeks after any bleaching procedure had been done.
authors.affiliation: Division of Dental Materials, Faculty of Dentistry, University of Pretoria.
authors.forename: P J
authors.initials: PJ
authors.lastname: van der Vyver
authors.forename: S B
authors.initials: SB
authors.lastname: Lewis
authors.forename: J T
authors.initials: JT
authors.lastname: Marais
mesh_terms: D003188:Composite Resins / Q000494:pharmacology*; D001840:Dental Bonding; D003743:Dental Enamel / Q000187:drug effects*; D004347:Drug Interactions; D006801:Humans; D006861:Hydrogen Peroxide / Q000494:pharmacology*; D066298:In Vitro Techniques; D016877:Oxidants / Q000494:pharmacology*; D013997:Time Factors; D014073:Tooth Bleaching
chemical_list: D003188:Composite Resins; D016877:Oxidants; D006861:Hydrogen Peroxide